SOLUTION: (4-9i)^2 Please show work thank you so much!

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Question 776141: (4-9i)^2
Please show work thank you so much!
Answer by MathTherapy(10552) About Me  (Show Source):
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(4-9i)^2
Please show work thank you so much!

%284+-+9i%29%284+%2B+9i%29

16+-+36i+%2B+36i+-+81i%5E2 ------ FOILing the binomials

16+-+81%28-+1%29 ----- i%5E2 = - 1

16+%2B+81, or highlight_green%2897%29